st: SUR, different no. of obs. and restrictions

Dear All,
I am estimating a system of demand equations. The
different equations have different number of
observations. I also want to impose restrictions
across equations. I would appreciate it if someone can
inform me how to do these three things at the same
time.
Kind regards,
Alemu Mekonnen
Alemu Mekonnen, Ph.D.
Department of Economics
Addis Ababa University
P.O. Box 150167
Addis Ababa
Ethiopia
Phone: +251(0)911 157055(Mobile)
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